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Swift extraction reports ambiguous NSAccessibilityElement for valid PDFKit source

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Évaluation

Difficulté
4/5
Temps estimé
3-5 jours
Accessibilité débutants
15/100
Type d'issue
Bug
Clarté
Plutôt claire
Activité
Active
Stack technique
macos, swift
Domaine
compilers, security

Piste de recherche

Start with the attached reproduce.sh and run it against the baseline and treatment Swift sources on macOS with the CodeQL bundle. Then read the extractor log entry citing SwiftDiagnosticsConsumer.cpp:62 to see how the 'ambiguous' diagnostic is produced. Done means both variants extract with no swift/diagnostics/extraction-errors notification while the PDFKit behavior cases still pass.

Rédigé par le modèle d'indexation à partir du texte de l'issue.

Description

Swift extraction reports ambiguous NSAccessibilityElement for valid PDFKit source

CodeQL 2.27.2 reports an ambiguous NSAccessibilityElement while extracting a small public Swift file that Apple Swift compiles and runs successfully. An explicit import class AppKit.NSAccessibilityElement leaves the same error. This comparison disproves that import as a remedy on the tested toolchain.

The baseline is the unchanged MIT-licensed Sources/ArgmaxCore/FileUtilities.swift from Argmax OSS Swift (formerly WhisperKit), revision 26577ce3017aae8c9edfd9a0dd17851bd248c731. Its SHA256 is 0578c91c01ab86695a6e56bb898480171c4d879b6eaad8a494fd321b75e98c4a. The treatment adds only this import inside the existing PDFKit guard:

#if os(macOS)
import class AppKit.NSAccessibilityElement
#endif

The tested environment was:

  • Xcode 26.6, build 17F113; macOS SDK 26.5.
  • Apple Swift 6.3.3: swiftlang-6.3.3.1.3 clang-2100.1.1.101; driver 1.148.6.
  • Explicit compile target arm64-apple-macos13.0, Swift 5 language mode, cross-import overlays enabled. swiftc --version reports the compiler's default target as arm64-apple-macosx26.0.
  • CodeQL 2.27.2, official Swift macOS bundle, codeql-bundle-swift-osx64.tar.zst.
  • Bundle SHA256: 25a08dfd23997ccf6374b5a70d9aa27a510e027f1b5aed60e1a653f8a3596375.
  • swift/tools/osx64/extractor.real SHA256: 680adbee37bdbfc5fe0a4b6d63c45bdae23fcf3bb2210530a7b751b58f319530.

The attachment contains both source variants, the original license, a behavior harness, invented text/PDF fixtures and reproduce.sh. Run it with the verified CodeQL executable and a new output directory:

bash reproduce.sh /absolute/path/to/codeql/codeql /absolute/path/to/new-output

The script preserves the tested compiler arguments, creates a fresh module cache and separate CodeQL database for each variant, then runs codeql/swift-queries:codeql-suites/swift-code-scanning.qls. The attached shell wrapper was checked with Bash syntax validation and ShellCheck. The recorded hosted execution used the equivalent commands in a Python harness; the shell wrapper itself has not been executed end to end.

Expected: both valid sources compile normally and extract without a compiler-error notification.

Actual: ordinary compilation, database creation and analysis all exit zero for both variants. Each SARIF nevertheless contains one swift/diagnostics/extraction-errors notification:

Compiler error in  with error message reference to 'NSAccessibilityElement' is ambiguous

Each extractor log also contains this error:

ERRO [extractor/compiler] <invalid loc>:0:0 reference to 'NSAccessibilityElement' is ambiguous (SwiftDiagnosticsConsumer.cpp:62)
Result Baseline Explicit class import
Apple file/PDF behavior cases passed 6 6
Required source included 1/1 1/1
SARIF extraction errors 1 1
Unresolved AST nodes 0 0
Extracted AST nodes 532386 525362
Successfully extracted lines 35 36

The six cases cover UTF-8 text, Latin-1 text, empty and missing files, invalid PDF input, and text/page order in a two-page PDF. Both behavior outputs have SHA256 46668bfa093cbbbb35dd864350e992e0f8bcba65985833195bf455fac47d4735.

The explicit class import preserves the tested behavior but does not resolve the extractor error. Please identify an extractor correction or a supported remedy that clears this reproducible error while preserving PDFKit behavior.

upstream-public-approval.zip

Attachment SHA256: 1e00b9184f9002b0beb26f7488a8922ced3a815aa08a66127681b6178efcefda (6,846 bytes).

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